package com.lyl.filter;

/**
 * @author 李亚龙
 * @version 1.0
 */

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.lyl.common.BaseContext;
import com.lyl.common.R;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import java.io.IOException;

/**
 * 检查用户是否已经登录
 */
@WebFilter(urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    //根据请求路径判断是否进行拦截或者放行
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI().toString();

        log.info("本次请求路径：{}", requestURI);
        //筛选出不需要拦截的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/login",
                "/user/sendMsg"
        };

        //2.判断本次请求是否需要处理
        boolean check = check(requestURI, urls);

        //3.如果不需要处理直接放行
        if (check) {
            //log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //4.1 需要处理,判断登录状态，直接放行---客户端
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已经登录，用户id为：{}", request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        //4.2 需要处理,判断登录状态，直接放行---移动端
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已经登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        //5.如果未登录则返回未登录结果，通过输出流方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));


    }

    //判断本次请求是否需要处理
    private boolean check(String requestURI, String[] urls) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
